Modes of Berm and Beachface Recovery Following Storm Reset: Observations Using a Continuously Scanning Lidar
Modes of Berm and Beachface Recovery Following Storm Reset: Observations Using a Continuously Scanning Lidar
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风暴重置后的护堤和海滩恢复模式：使用连续扫描激光雷达进行观测
DOI：
10.1029/2018jf004895
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Ian L Turner
中科院分区：
文献类型：
--
作者：
M. S. Phillips;C. Blenkinsopp;Kristen D. Splinter;Mitchell D. Harley;Ian L Turner
在风暴侵蚀的快速和破坏性影响之后，海滩恢复是一个关键的自然恢复过程，将被侵蚀的沉积物返回到陆上海滩并重建海岸形态。虽然通常对风暴侵蚀的影响进行了调查，但目前缺乏对风暴后恢复的详细研究。本研究探讨了波浪驱动的微潮冲刷沙地上的堤道和滩面恢复过程。在一次重大风暴事件完全清除了护堤之后，利用连续扫描固定激光雷达的高分辨率（5赫兹）冲刷和地面海滩剖面测量，在每个半日潮汐周期的时间尺度上分析了整个76天的冲刷护堤重建过程。在护堤恢复期间，最常观察到的逐潮陆上体积变化率在1至2立方米/米/天之间，包括损失和收益，其数量级大于整个恢复期间观察到的更渐进的净收益率（0.7立方米/米/天）。发现堤峰形成和垂直生长的模式主要受总水位的小潮-大潮变化的支配。滩面和护堤体积随潮汐的变化被用来对恢复期间地面剖面变化的四种主要行为模式进行分类。采用决策树分类方法，根据近岸无量纲落差速度、堤顶冲刷超出程度和海平面进行模式划分。这些发现为在整个风暴后恢复期间，冲刷对滩面和护堤的逐潮重建提供了新的行为和参数见解。
Following the rapid and destructive impacts of storm erosion, beach recovery is a key natural process of restoration, returning eroded sediment to the subaerial beach and rebuilding coastal morphology. While the effects of storm erosion have commonly been investigated, detailed studies into poststorm recovery are currently lacking. This study investigates wave‐driven recovery processes of the berm and beachface on a microtidal, swash‐aligned sandy beach. Following complete removal of the berm by a significant storm event, the entire 76‐day rebuilding of a swash berm is analyzed at the timescale of every semidiurnal tidal cycle, utilizing high‐resolution (5 Hz) swash and subaerial beach profile measurements from a continuously scanning fixed lidar. Tide‐by‐tide rates of subaerial volume change during berm recovery were most frequently observed between 1 and 2 m3/m/day, including losses and gains an order of magnitude larger than the more gradual rate of net gain (0.7 m3/m/day) observed for the entire recovery period. Patterns of berm crest formation and vertical growth were found to be primarily governed by the neap‐spring tide variations in total water levels. Tide‐by‐tide beachface and berm volume changes were used to classify four principal behavioral modes of subaerial profile variability during recovery. Using decision tree classification, modes were differentiated according to nearshore dimensionless fall velocity, swash exceedance of the berm crest, and ocean water levels. The findings provide novel behavioral and parametric insight into the tide‐by‐tide rebuilding of the beachface and berm by swash throughout a complete poststorm recovery period.
影响因子：
4.4
作者：
Blenkinsopp, C. E.;Turner, I. L.;Russell, P. E.
通讯作者：
Russell, P. E.